Summary questions 1. Copy and complete the sentences.
All substances are made up of very small particles called ____________. Substances that contain only one type of atom are called ____________. The three subatomic particles are ____________, ____________ and ____________. The atomic number is the number of ____________ in the nucleus of the atom. The mass number is the number of ____________ and ____________ in the nucleus of the atom.
2. Explain why water (H2 elements.
O) and carbon dioxide (CO2 ) do not appear in the periodic table of the
3. Research and write down the names of two elements that, at room temperature, are: a. solids
b. liquids 4. Use the table below to answer the questions that follow:
Element Atomic number Mass number Oxygen 816 Chlorine Zinc
Tungsten
17 30 74
35 65
187
a. Which element has the highest number of protons? b. How many protons are in an atom of oxygen? c. Where are protons found in the atom? d. How many neutrons are in an atom of zinc? e. Which element contains the same number of protons and neutrons? f. Draw a Bohr model and write the electronic configuration for oxygen and chlorine.
5. The following table shows the percentages of the different elements in the rocks of the Earth’s crust. Look at this data and discuss it with your class.
a. Construct a graph to represent this data. b. Why is the type of graph you have chosen appropriate? c. What other type of graph would be suitable and why?